不同蛋白质含量小麦品种叶片NRA与氮素积累关系的研究

以鲁麦５号和昌乐５号两种不同蛋白质含量小麦品种为材料，研究了各生育期叶片ＮＲＡ与氮素积累的关系。其结果是，在不同施氮量下，各生育期叶片ＮＲＡ、ＮＯ３＾－－Ｎ、ＮＨ２－Ｎ、还原Ｎ含量皆随施氮量增加而增加，但生育前期昌乐５号的毕大于鲁麦５号，而生育后期则相反，鲁麦５号的皆大于昌乐５号，籽粒蛋白质含量亦为鲁麦５号高于昌乐５号。表明生育后期（开花期后）叶片ＮＲＡ是反映籽粒蛋白质含量高低的一项重要指标。

Study on the relation of NRA and nitrogen accumulation in leaves of different protein content wheats

The relation of NRA (NRactivity) and nitrogen accumulation of leaves in each growth stage was studied on the two different protein content wheat varieties,Lumai 5 and Changle 5.The results showed that in both Lumai 5 and Changle 5 the content of NO - 3-N,NH 2-N and reduced-N as well as NRA increased with the increasing quantity of N application.Furthermore,NRA and the content of NO - 3-N,NH 2-N and reduced-N of Changle 5 were higher than that of Lumai 5 in the early growth stage,but in the late growth stage the result was reverse.Like NRA,the content of grain protein of Lumai 5 was higher than that of Changle 5 in late growth stage.The results indicated that in late growth stage NRA of leaves was an important index of grain protein content.